Questions about my 250 Xciting

[cman59]

Hey guy's.. as some may know.. I have a 2010 Kymco Xciting 250. and It has 1100 miles on it... I bought it at 1000 and I changed the Motor oil to Casterol GTX synthetic blend, and changed out the gear oil with vavoline 80 w I believe. here some questions..

1. Even before I changed all the fluids... sometimes when im driving I will hear a vibration noise in the engine, which It dosent shift weird or anything it just makes a noise. it's not constant, but every now and then. no knocking.

2. I was giving 2 sets of regular keyes and I also have 2 smaller keys that are kinda flat? on each side it says open and shut? what are these for?

3. When should I change my coolant? and how hard is it to DIY?

[ts1]

Noise may be from the variator (belt vibration).
The flat key is for the keyhole shutter.
Coolant and gear oil ist changed very unfrequently. I don't have the manual now, but for sure it is in intervalls of many years. At least the coolant change is difficult, the system must subsequently be de-aired.